Please click above buttoms to enter the related topics: Multiplexers: telecommunicational Multiplexers and Modems, data transmitting on E1, T1 or T3 signals, multiplexing/demultiplexing 4, 8, or 16 E1/T1 signals, SDH digital signal loop carrier. Simulator: NSAS-SS7, platform developer for SS7 OSS. Others: custom design of telecommunication modules and systems